﻿using System;
using System.Globalization;
using System.Windows.Data;

namespace QuailDashboard.View.Converters
{
    /// <summary>
    /// Converts dates to an easier-to-read format for test results
    /// </summary>
    public class RelativeDateConverter : IValueConverter
    {
        /// <summary>
        /// Modifies the source data before passing it to the target for display in the UI.
        /// </summary>
        /// <returns>
        /// The value to be passed to the target dependency property.
        /// </returns>
        /// <param name="value">The source data being passed to the target.</param><param name="targetType">The <see cref="T:System.Type"/> of data expected by the target dependency property.</param><param name="parameter">An optional parameter to be used in the converter logic.</param><param name="culture">The culture of the conversion.</param>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var dtdata = (DateTime) value;
            var dtnow = DateTime.Now;

            if (dtnow.Date == dtdata.Date)
            {
                return "Today, " + dtdata.ToString("T");
            }

            var diff = dtnow.Date - dtdata.Date;

            if (diff.TotalMilliseconds < 0)
                return dtdata.ToString();

            if (diff.TotalDays < 2)
                return "Yesterday, " + dtdata.ToString("T");

            return dtdata.ToString();
        }

        /// <summary>
        /// Modifies the target data before passing it to the source object.  This method is called only in <see cref="F:System.Windows.Data.BindingMode.TwoWay"/> bindings.
        /// </summary>
        /// <returns>
        /// The value to be passed to the source object.
        /// </returns>
        /// <param name="value">The target data being passed to the source.</param><param name="targetType">The <see cref="T:System.Type"/> of data expected by the source object.</param><param name="parameter">An optional parameter to be used in the converter logic.</param><param name="culture">The culture of the conversion.</param>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}
